var good = true;

function checkEmailAddress(address) {
  var goodEmail = address.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\..{2,2}))$)\b/gi);
  if (goodEmail){
    good = true;
  }
  else {
    alert('Please enter a valid e-mail address.')
    good = false;
  }
  return good;
}